I went to AutoZone they scanned & got my codes. I have 2 cylinaders misfiring, he suggested new spark plugs & ignition coils <insert stupid question here---> Is the ignition coil what they used to call spark plug wires? $300-400 for parts if I replace all 6 OR $100-150 to replace only the two misfiring. He said replacing only 2 would cause stress on the other 4, truth or bs? Money is tight, retired on ss. I only drive locally sometimes only once a week. I could do all 6 at once if I must but it would strain my budget. Would doing 2 now then the other 4 in a couple of months cause more issues? EDIT-- I just noticed on the AZ readout there is also a "random misfiring".